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  • concerning the evolution, often very complicated, of littoral spits, sand cays, and motu. Arrecifes, on the SE, S and SW coasts of Madagascar, are not Flandrian beach rocks, but probably contemporaneous with the post Eemian regression.
  • Beach-rocks of coastal beaches or of sand reef cays could be considered as witnesses: 1) of the coastal morphology, of the sedimentary conditions and of the altitudinal sea level| 2) of the wave-exposure. It's in this view that are analysed: 1